* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Arial', 'Helvetica Neue', Helvetica, sans-serif;
        }
        body {
            background-color: #f8f9fa;
            color: #2d3748;
            line-height: 1.7;
            padding: 2rem;
            max-width: 1200px;
            margin: 0 auto;
        }
        header {
            text-align: center;
            margin-bottom: 3rem;
        }
        h1 {
            color: #2b4367;
            margin-bottom: 1rem;
            font-size: 2.5rem;
            font-weight: 700;
        }
        h2 {
            color: #38588b;
            margin: 2.5rem 0 1.2rem;
            padding-bottom: 0.8rem;
            border-bottom: 2px solid #4a89dc;
            font-size: 1.8rem;
            font-weight: 600;
        }
        p {
            margin-bottom: 1.2rem;
            font-size: 1.05rem;
        }
        /* 图文排版容器 */
        .content-section {
            display: flex;
            flex-wrap: wrap;
            gap: 2rem;
            align-items: center;
            margin: 2rem 0;
        }
        .content-section.reverse {
            flex-direction: row-reverse;
        }
        .text-block {
            flex: 1;
            min-width: 300px;
        }
        .img-block {
            flex: 1;
            min-width: 300px;
        }
        /* 图片样式 + hover特效 */
        .cover-img {
            width: 100%;
            height: 380px;
            object-fit: cover;
            border-radius: 12px;
            margin: 1.5rem 0;
            box-shadow: 0 8px 24px rgba(0,0,0,0.1);
            transition: all 0.4s ease;
        }
        .content-img {
            width: 100%;
            height: auto;
            border-radius: 8px;
            box-shadow: 0 6px 20px rgba(0,0,0,0.08);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        .cover-img:hover, .content-img:hover {
            transform: translateY(-8px);
            box-shadow: 0 12px 30px rgba(0,0,0,0.15);
        }
        .img-caption {
            color: #6b7280;
            font-size: 0.9rem;
            margin-top: 0.8rem;
            text-align: center;
        }
        /* 列表样式 */
        ul, ol {
            margin: 1rem 0 1.5rem 2rem;
        }
        li {
            margin-bottom: 0.8rem;
            font-size: 1rem;
        }
        /* 提示框样式 */
        .callout {
            background-color: #e6f4ff;
            border-left: 4px solid #4a89dc;
            padding: 1.2rem;
            margin: 1.5rem 0;
            border-radius: 0 8px 8px 0;
            font-size: 1.05rem;
        }
        strong {
            color: #2b4367;
            font-weight: 600;
        }
        /* 响应式适配 */
        @media (max-width: 768px) {
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.5rem;
            }
            .cover-img {
                height: 220px;
            }
            .content-section, .content-section.reverse {
                flex-direction: column;
            }
        }